Select the correct option:
$(1)$ Thyrocalcitonin maintains the level of sodium / calcium in the blood.
$(2)$ Thymosin of the thymus gland is a steroid / peptide hormone.
$(3)$ The adrenal cortex secretes many hormones. They are commonly called corticoids / catecholamines.
$(4)$ Glucagon / Insulin is secreted from the $\alpha$-cells of the pancreas.

(CALCIUM, PEPTIDE, CORTICOIDS, GLUCAGON) $(1)$ Thyrocalcitonin $(TCT)$ is a hormone secreted by the thyroid gland that regulates blood calcium levels.
$(2)$ Thymosin is a peptide hormone secreted by the thymus gland.
$(3)$ The adrenal cortex secretes hormones known as corticoids,while catecholamines (like adrenaline) are secreted by the adrenal medulla.
$(4)$ The $\alpha$-cells of the pancreas secrete glucagon,whereas $\beta$-cells secrete insulin.